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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee208135f822f69bc4e92c392d62dea69568ad0ac230ea1f9e09cd73957409da' 
  AND token = 'A3PmaxAbT9LPXD6ZK3T5kGz36hQ44XsY+Hb1X90Dkho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}