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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b52b86414ba9b86ccfddbc746622f62d0efda124f542947ad0a4c1ccec538b' 
  AND token = 'C5t3RHeqPYuY6+iJaLwOqdeeAaFoKu9xvn2VM3DeD/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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