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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eccd3121df5be82d5583ff15dc8253d7e36586e90b590243d4c015ef6926892' 
  AND token = 'Tm76rPTacVk6xDTUYvyDfnl9DGp8KXwOoA5OY2WGlmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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