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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a0c014d62f570121c00842144c6b043f07724ddfafcad6bcf97348aa152cb7' 
  AND token = 'ANL6aPUPhu8usJyAOL10aCzukZeX2f3oZN+4AcyHhJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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