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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd209a581c9888f30acf3caf55a089fa304e1beeea25189b2bc87cc36f2926c7' 
  AND token = 'rjk7IjldbMlaMteKBL3cAc/evovnQxlK+XsJAP6dosY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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