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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3e11e2978ec19f10bb1c22282aa80572259a64b7a5b58d38504c9fcbb1e5e9' 
  AND token = 'VAid+Y94aYqbWJZ/MtMoKWGcx9im9sd1dDmuJp37X/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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