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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0146b85dc4ae538c6ffdb2cbe9bd644223b520bf856bcc423e3ef83f5fa2dcc3' 
  AND token = 'aiizpNYPoq5llQauoQc5ocvx5PcDtW7IdJ8aog3tCr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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