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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ebdf02ee099d1a017594e681b138ea8dc42375a37ac5c9f37ef467cbe71367' 
  AND token = '9ezTTW8fYQxdL3vN8k69vWWt8q6kolzx3k/4sf7w9vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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