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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db6c0cd24e9744ec9c16f348afb3d6a4b440b74d18f7e65e00dc5e82eed5f59' 
  AND token = 'FVoWFxVIdU6hSUKb3YpRWcH6SUDcrjgPEUkbL6Cdbkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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