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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50062af4380fac52b0acc2b59d14a9e94c6f3860681a759a21028d58b354436b' 
  AND token = '91snx3ANmoi0tNw6yl9QZGX4SmEup/vh2i+8WhucTK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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