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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7215e47ddb2335ea7628152c8bcee601bdf2a3d7693fab3d52176de6386d0937' 
  AND token = 'ocofatz0+k8pP6PTX5A2+qpOhVBay5nfH8syL56QAqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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