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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06886c91a4f90fe2d06d356e0dd513a1c10ccf5c703422c3ee9c66c3cba42b2' 
  AND token = 'OwjfV6qU50qW7v+Xh2DACN9tSjjTZnNow9SoRhIBjlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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