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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8fb99a6cd3ba9f4a5ccfa8e0365fcf54f02f1a20984a42accc56424ce67183' 
  AND token = 'o2RLXfmJhh1pg1a9Q5urN8f4gQLSg86nxchV1S3jiGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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