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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770fe71c788c2a73f37f8f0bc8b09bd08065f104dea089857bd67f465db64909' 
  AND token = 'Bpq6pP2fA2N7b9gA1uBbb82rmXdCzOaYTX3qZm8Qd04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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