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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd76cf5a72c450918b8d50372c04465cd4fb04bd7f7a796ce2f19dc9dc4e9d9' 
  AND token = 'yDi/7iBm7LIJWwHNEsBvH5YKlYgAYO0G7ezrh4/vHdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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