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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8736e389ab2728745564647eeeec2d4859d6db677e8190cbb88b49973745163d' 
  AND token = 'b2Pzi9wB2FmK/RgY9Vq+NzirRqmrkk7BrLSpF6wHPeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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