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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bae90e60428ea350961392ef800ef2a78f47b260bc8a0203a778e84ef5cca19' 
  AND token = 'wkw83tx1zWYQpsqFjofCLOTC26P16x6vEW0KDtNOCzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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