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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a0f61c8c0d42801af335de5dc8abf80f82ce1dc5b13a9bb303233aeb0b3f60' 
  AND token = 'TQsXocekZVt7/dEOiXEXpky/gtgy+ykYCwq0R4TYC2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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