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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4f4918166e29105b40573786eb5d4ac8b2ef66de96e0af515c987b99a1be35' 
  AND token = 'd3t8zyLwlvxlNaB4V5irz5qKLszCdw2zU7fdfEserMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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