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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629bd05016a1f5ffb9f6fa4cb5e8cdd27bf4b2b35547900d83c2038af0b4059a' 
  AND token = 'wWmmbc3Z8mISwNU63M3EyouUW3pZvAI+s85eYEibL9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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