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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f08d0658a3c2fda38d0528b355f48206388fcad75dbfc152906b3358d374d16' 
  AND token = 'd8c4ea37ioBgL8JOizKc7/tTCp6VX4dzO+23ZHKzVK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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