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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e6348e62b4e56d15ae8d8bb3d8a9f6b4efa484f83c32c2485971d892b83527' 
  AND token = 'DWo0K4Ek0+ZGolHEMJB6pyFpT5jvt2uxpfMi+ijKeYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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