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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc7637b3e657bdae66bf5a411b09dc9629378fa450919a9763bbd839562cf70' 
  AND token = 'wXBQWgSqICkM0lHlMPMTnPPgySlBj60bwYY7MWLWBFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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