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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef20cf0d3210ecf70c2608de143ecf768bf6eb6ee2fc9a4dcb3925b2687124ae' 
  AND token = 'iQt2EyPg6rnEFvSMBIVGvd/ss7VVb2G1cniHeg52t4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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