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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc647ddc57f2d6e0d4c1f29ec32612bf8aa2ac8069fa1cec67fb025ed80ac0c' 
  AND token = 'OAKcI2HY1Attq01l54nB1sy85BGlY3drR5OpKeCPEq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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