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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a09c068e70aa857a076bf84f32f89b92919d5ae7f620cf22a551bc8842b8a4' 
  AND token = 'NIDD/4sLmxtiLRlVE4v0jkkP7bqPZRJBUd63FfZxDtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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