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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1861df1ea93e69231bbe0a42beee3d4aad1e651f5065b7accbb56dc5d68bf9b' 
  AND token = 'G9y1I4DKgfB41qF6l8UcaZ9v0gFM3ltaK+w9weNz5UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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