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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3be34c033317a1f4fb56a5e8fd73a5bf6fe20a83a26810b8952699b594d0a0' 
  AND token = 'SVfyZkcwyV+gh23Z+aeZJ2zh58noilwGh7i9TkuI0zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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