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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'befa4f269f663561a7837c34b8a673ce2eda7785bd0bc5718ca9e1fb75a5adf7' 
  AND token = 'i77xJfItAS+ZScOHzjSqhPUmFdpJ0xllvRl3tVU2b8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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