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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab62b12111bc9217141dc405bac1b2102207d88642c609f76c89122158271c2' 
  AND token = 'p92i/wOiVtmSXBcO5ToObVMEA1HpMX98RPS1bsX8qWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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