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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900dadb5fa4815cc45c7cb843dade410744ef869f9f6f2e159a5afe5a631fc36' 
  AND token = 'ZLa6erUssvhqz7nCwvI4Klz4x7GKkSTgRaTYnDWZdLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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