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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb007a42e32d5f2078e42cc888eea4be351b537d971e8eff2f574c65d9e2ed7' 
  AND token = 'VWW9iNdbw/pvsmBFyKpijtM5IAIi23xuD3heOT6iivs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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