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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ce41340ae7b820972ef4b0032767ec3b3f936152c06839cf2de4964ebbfc5e' 
  AND token = 'k+8tJUOZ92gxlJW46Ymb9H+++35E+3wIOLeciIWjxMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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