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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea52d010b5e205db1db9621861688b300919ab4989d51fbf4b9e36e06099fd34' 
  AND token = 'Fp2CYk4Vul34avFvOSGClsU5qhypsA7L50phSq4mvwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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