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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803ae5e73b9fdd51c33371070575c8100c14d0eb76997892d03c6e5e1b0551d2' 
  AND token = 'q0/fBAusBUms1HnYs3a3KPNk1SyI45jARRW1OKHoSLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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