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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b86d5341c3fd2ef9cd923465d793f16d2a576a6489b0f6c6b559d199449be1' 
  AND token = 'P8KN7SOV3LuVf+uqlV7e54RuxJxPLGSl0AeM2FXQtzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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