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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b0e4a882b45cef96aba7f9efdb6a4efd4b16c1a735c7bbdbddddbe5e05993b' 
  AND token = 'fw1SgYRNRgyKnqbVCy+h+i/nTHpnjDz4ap3aqzsyG7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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