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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6a0614b0053b46f6bf67a5a44a02d7206ed68fc917c61e8d3ce6a445fbb859' 
  AND token = 'q3T9Ni42dUOAfepggXOj9DEJoHLfebgc9Q9qn48rcMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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