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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9aaa468ffb910b194cd6d91b87bda75c4428fc187252abc542d7f96729a875' 
  AND token = 'OYfCrp4NOVY0mexl9vja3IArislpj+nM3GWBbS/R3R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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