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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47329938da2b7adb19376f35dd586a11875ef610ce7e9420d93271c09ad2eaf2' 
  AND token = '8BFI1U/DPrfp2rHdYsKd15DyvWTUoN/e1UO+r8qM8Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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