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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97719b5a73bffb225af36dfeb6cefb075b8ca5f224ac60ef6b2af8912287c80d' 
  AND token = 'rPU+9oUIKNQIRgPgiHh/Wteo+V2yHTyGMTsnDfU9fQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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