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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ca97d406327cc5521109be3b73deedc3ca5f9f83a8c1f37eeed23770445525e' 
  AND token = 'PCyxHkaeI2Q40AuVR9R/W7XlONTgV4H4MtgbJhR03+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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