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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71642f043d00d039a9703c6ea948d3c7135c18389e18b0527bf200c9c955e0ec' 
  AND token = 'i+Y3kc8U98E+eXl2rCPJRHfM9vlXHhpEmpXq78ri03A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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