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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030fbf8963f9d53cc52dee3ba060e6d17970e4a2a0867911986d0d82fa939440' 
  AND token = 'A2Fgg5x4RbZv/J4z4OpSp3bt9AbYJqNSFa26EpFwsFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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