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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37573cc0456bc29d781d6d1221785a0fe56dde7187e962b2c6732c0e827831a6' 
  AND token = 'hC3Y+wdLRdyBKVDQqHAFZ+rNwaXE9Wcyteimk9RDIYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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