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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb0f2bac95bae97ae4324db424546c4d2ac77d784d4154cfd9b3f5335e078da' 
  AND token = 'rYHZtWmZtC1xJzbJOgc+ydpCrtAcWMg5HcG+Ecop094=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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