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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd8ebf874671c75882b5ba76b0cd973badaf2a76da9f11594ea21677f5b5470' 
  AND token = 'bwT8UulCM3tiA3FF0hB7FdiHORgvhZWhXF+UBtCG/BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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