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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9232e6d4770e407da97fe3b98f1570fb980440f8e47296d718699502a2e98dd5' 
  AND token = 'J5/pil+yTjsAWTdZCyHD0+J/GZKOLbfxVJidTe2Iua4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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