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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a950b3a2be44bb0663fef255b489d23abeab0c6cb76ae0bf7a34350022e0d2a4' 
  AND token = '38sgsKUjJVOs+Slt2uAcQLfwaXljo5mltvDSbTNYzqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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