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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b43758b967380730836d245f77427fc32e5d6e0faac7c0b42590046b98ea4ac' 
  AND token = 'zJ/CzXTUcQUkkzxvd9y4I+OCNdJ0tNcKgENXHbxh0MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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