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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593b9162ffef077432c48bfc68585754056d3c5b1d7254b28e2c8dbe762151e5' 
  AND token = 'jmWThdQEN+Iy87aEce29d3xo9BYq7UuGJUFEDHXFqY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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