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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b07205ed84ede8a139fcd9eba6f3cc263b03cade0e356562688ad11c333a584' 
  AND token = 'SUFzx44XSk/C5c+d0gOKMVMEDfieOpqoctYB/pRmqsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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