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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462c7e762cbd017f20a01ea412b2197b830e631ac7462c42a7befc5e0dc2e0ac' 
  AND token = '++ibnwE9QB4PqfPciy6i6IGOFk5/oaVTgsm7JLJnyqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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