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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33abaa7dc36fe20ec9bb78c00808fbaa7f65cf7b90ad877d6cbbb150f977e60' 
  AND token = 'FG2X0bwtvDt328YF0bow0OwQqDC+gRtxdpNFe4Ia+94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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