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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1867bd81b26fa8cca0d050fff0d048b942d8d258f587207469d18ea2db122f09' 
  AND token = 'BoIYVkJnubIzWi6RroSjBcXhS52dIevEqnBUq6I8vkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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