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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e51e9d1dd6fbe922560767abbebaea2384f2ad57df8212b30c2449f975930e' 
  AND token = '5BdJUkja5dWQD1Q9tOESKA9bJ/8X42KG2AmvNMWehuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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