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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46c986abf6e07a0532c5f544a6d4b336728aedaac236d0cb7144d47171c43bb' 
  AND token = 'Ssn6rE7iN8BF4npgGZibKeR/HmpLWWXYcEccjzx3Nu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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