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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917aded1156935d57728b2bdf6fbe4119623baa74a2704a2f2b6d66013a9ceb0' 
  AND token = 'aXK8ld0F25tEd30a1O0CCs/1JhVGJOhH/g4gQ3AFmII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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