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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcab31abe2707ac9b65448954a37608010e998173f18f3f21ffa71f6470420f9' 
  AND token = 'n0Oy5FhV0cxezACYmHP3tIccCeb60XEEsgMy1pDiMCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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