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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95be5a053e0f117ae38060fcfe8818002e0cafcf4c382ba03ce3a6c2c42f940' 
  AND token = 'levQ1/tuBwe17UbNaNVcB7JkNMLP5c+0dL7M6pYQUoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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